demux: adaptive: we don't need to check availabilityStartTime
mandatory for templates and breaks with epoch 0 refs https://livesim.dashif.org/livesim/sts_1647955042/sid_f95b592d/testpic_2s/Manifest.mpd
mandatory for templates and breaks with epoch 0 refs https://livesim.dashif.org/livesim/sts_1647955042/sid_f95b592d/testpic_2s/Manifest.mpd
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